(WARNING: The following contains MAJOR spoilers from the manga, so if you are not up to date on the current chapters or are an anime-only watcher, DO NOT READ.)
I know, I know, I'm basically saying DC will end soon, and virtually everyone is skeptical of that. However, recent events in the manga and Gosho's responses in certain interviews lead me to believe that Gosho does plan to go ahead and finish the series soon. My list of reasons are below. (Also, when I say soon, i mean around 4-7 years, no literally this year or the next)
Gosho’s answers
Gosho has stated that he wants to retire when he’s Agasa’s age, which is around 52, which is pretty close to Gosho’s current age. More so, Gosho has stated that DC will not exceed 160 volumes, but what’s even more interesting is Gosho’s apparent remark that he “is not sure” if DC will reach 100 volumes. Now, if Gosho was really planning to stretch his manga on forever, would he really make these comments? His uncertainty regarding DC’s 100 volumes shows, at least to me, that he’s planning for an end soon. Besides, Gosho has decided on an end, so he does plan to finish DC someday.
The Breaking of DC’s status quo: The advancement in relationships
Specifically in the Bourbon arc a lot of progress has been made in terms of the different relationships going on. After hundreds of chapters o fteasing Sato and Takagi’s relationship, they finally confirmed their feelings for each other and are in a steady relationship. Even more remarkable is the end of Shiratori and Takagi’s rivalry, a conflict that was present for hundreds of chapters as well. Shiratori confessed to Kobayashi about his feelings in one of the fastest developments of DC, thus putting any doubts to rest. Gosho intends to write a marriage case between Takagi and Sato someday. Besides all this, Shinichi finally confessed to Ran and both are aware of their feelings.
The point is, Gosho simply kept the drama/love stories going for a long time before finally beginning to give some closure to them. Yes, he did start another love story with Chiba and Naeko, but that one can be wrapped up pretty quickly. I think it was meant as a temporary replacement for Takagi and Sato’s story, which is largely resolved. The point is, I think that Gosho is gradually finishing up these plotlines. Why, I wonder?
The Breaking of DC’s status quo: The existence of an Org member close to Conan daily
By having Amuro stay as Kogoro’s apprentice, Gosho is essentially keeping Amuro present in all of Kogoro’s subsequent cases, a truly major development in regards to how Gosho usually does things. In all the arcs before this one, after the grand revelations, things would go back to normal for Conan until the next threat comes along. Instead, Gosho had Amuro, a member of the Black Organization, come back to remain Kogoro’s apprentice, ensuring frequent contact between him and Conan. Amuro has already begun to suspect Conan. One could argue that a Black Org. member close to Conan already happened with Vermouth as Araide, but after Vermouth’s reveal she left Conan alone. Moreso Vermouth isn’t very loyal at all, and she doesn’t want to hurt Conan and hasn’t reported him despite knowing his true identity, so Conan’s safe. Amuro, however, is smarter than Vermouth and has proven to be very loyal, reporting Sherry to Vermouth as soon as he tracked her down. Having a member this dangerous stay close to Conan in his daily life is bad and only foreshadows disaster in the future. DC’s status quo has never been broken like this before.
Ran’s suspicions
We’ve had several Ran suspicion arcs, and they all end the same way: Conan comes up with something to trick Ran and avert her suspicions and the status quo is preserved. Gosho has been dropping hints over the course of the Bourbon arc that hint towards a coming suspicion arc. I think there’s reason to believe this one could end differently.
I noticed that pretty much all the previous Ran suspicion arcs came suddenly, as in they built up over a single case and were resolved within that same case or the one right after. The only exception would be the one in Desperate Revival, which was simply a result of Ran not losing her suspicions the previous time in the first place. This one, though, has been building up since Ran first mentioned to Kazuha her question about Shinichi’s fingerprints on Heiji’s omamori. From then, Gosho dropped more hints as well. For example, Ran’s casual reference to DNA testing being used to reveal a person in disguise when she was talking with Conan in Ch. 794 is one. The most obvious foreshadowing came in Ch. 814 when Conan messed up and referred to Yuusaku as his dad in front of Ran. She grabbed him and looked into his face to reassure herself he was Conan, saying, “Conan-kun, right?” The chapter’s name is even derived from this exchange. The point is, no other Ran suspicion arc has ever received this much build-up.
Even more significant than the foreshadowing is the way Gosho is setting it up. Ran knows that Heiji’s omammori, which she saw only Conan touch, was used to somehow prove the false Shinichi’s identity. That means Shinichi’s fingerprints are on it. If she gets access to the charm, she’ll have Shinichi’s fingerprints. All she needs is Conan’s fingerprints, something she can find easily, and compare them to confirm what she suspects (of course, I’m not saying Ran will be able to do this, just throwing it out there that it could be possible.) Also, in the Mouri Detective Agency case where the Conan solved the case over the phone, Ran was wondering how Shinichi got access to Conan’s phone. Lastly, Ran saw Conan use his sneakers to knock out one of the attackers in Ch. 814. To my knowledge, this is the first time Ran has seen Conan use them. Basically, unlike previous times, Ran has a whole arsenal of incriminating information that she can use against Conan. This huge and carefully calculated build-up seems to point to it leading to something climatic. If Ran is tricked again, it would be extremely anti-climatic. Besides, Gosho has hinted that something is preventing him from revealing Ran’s birthday; this might be because that’s the day Ran’s final suspicion arc will begin/conclude.
The bringing back of old plot points
One notable aspect of the Bell Train express arc was its bringing back of old unresolved mysteries like Itakura’s CD. What Elena told Haibara on those tapes was around 400 chapters previous was finally revealed, and the mystery of Vermouth’s youth came back up once again after not being addressed in the arcs that followed the Vermouth arc. So instead of introducing new elements and aspects to the story like the Kir arc did, the Bourbon arc is essentially Vermouth arc 2.0; it’s like a sequel that continues the unresolved plots from the Vermouth arc. I find it interesting that Gosho has finally made these mysteries, which have been unresolved for around a decade, become relevant to the current story once again. Seems to me that Gosho might be planning to wrap up some of these mysteries in preparation for the final Anokata arc.
The Bourbon arc’s climax
The Bell Tree Express, contrary to what many thought, did not end the Bourbon arc. Instead, it was more of a very major BO case but not the finale. Gosho chose to reveal the identities of the different characters before the arc’s climax. Why the change? Obviously many things remain unexplained, and with everyone’s identities in the open, Gosho can focus on explaining the other stuff and gearing up for what may be the most climatic finale of any arc in DC history so far. I think the Bourbon arc is going to feature some pretty major developments and could be a game-changer, especially it includes Ran’s suspicion arc and Akai (no longer Okiya) and Haibara’s long-awaited confrontation.
Conclusion
So those are my reasons. Agree? Disagree?
As for Amuro, I really think that he is hanging around for the Amuro Akai fight, which may be the climax of this arc. And who knows, Amuro might even be an ally in the end, like Vermouth. 
